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Physics

Physics
The unit of noise pollution (level) is :

Decimal
None of these
Ppm
Decibel

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Physics
During the motion of a projectile fired from the earth surface, ________

Horizontal component of its velocity remains constant
Its momentum remains constant
Vertical component of its velocity remains constant
Its kinetic energy remains constant

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Physics
The commonly used coolant in refrigerators is

Nitrogen
Oxygen
Ammonia
Freon

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Physics
When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs in the loudness of tone. This phenomenon is known as

Beats
Echo
Doppler effect
Resonance

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Physics
Which of the following are used for accurately measuring very small time intervals ?

Atomic clocks
Pulsars
Quartz clocks
White dwarfs

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Physics
Materials that usually are good conductors of electricity?

Aluminium
Lead
Nickel
Wood

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